Use: Firstly, hole to that the hose fitting can pass through the panel from side of panel; then, tighten the hexagon threaded nut from another side of panel; next, install gaskets to leakage; lastly, connect hoses (not included Package Content: You will receive 10 sets of 3 / 16 thru-bulk barbed bulkhead fittings, each set includes a thru-bulk barbed bulkhead fitting, a hexagon threaded nut and a gaskets They can fit 3 / 16 " hose inner diameter perfectly : Our 3 / 16 thru-bulk bulkhead fittings are produced of good PP, sturdy and long-lasting, ensuring long-time service Versatile: The 3 / 16 thru-bulk bulkhead fittings can be widely applies for home aquarium, fish tank, garden, laboratory, food and beverage factory Product Feature: With smooth surfaceand inner wall; light in weight and small in volume Excellent craftsmanship makes more They can well withstands the pressure of 125PSI and the temperature from 9°F / 22.8°C to 176°F / 80°C but please note that they are not oil-proof, Manufacturer: Tsophreniq